This position is closed and is no longer accepting applications.

Software Engineer, Web Platform

Mercari Minato-ku, Tokyo
  • 💴 No salary range given
  • 🏡 Fully remote
  • 🧪 Minimum years of experience unspecified
  • 💬 No Japanese required
  • 🌏 Apply from abroad
  • 🧳 Relocate to Japan

About Mercari

Mercari Minato-ku, Tokyo

Mercari is a marketplace app that makes it easy for people to safely sell and ship their things. Having been downloaded over 100 million times, it is now among the largest peer-to-peer selling platforms globally.

Key benefits

  • Full flextime
  • Outside work encouraged
  • Employee stock ownership program

About the position


We are the team that provides the web infrastructure and common functionality for the Mercari Group’s web applications. Our responsibility includes:

  • Develop and maintain authentication pages and APIs on web
  • Develop and maintain infrastructures and services to provide HTML and other web related contents
  • Develop and maintain infrastructures and tools to improve reliability, productivity and security for web applications
  • Cooperate with frontend teams to develop and maintain the web application.

Bold Challenges

Our team is trying to improve both the quality and productivity of Mercari’s web applications. We use our knowledge of all aspects of the web, including front-end, back-end, infrastructure, and security, to provide infrastructure and services. For example, we did these actions:

  • Design authentication flow based on OpenID Connect specification, implement authentication screens and APIs by React, TypeScript and Go
  • Provide network routing with canary release feature for web applications on Kubernetes infrastructure
  • Provide Google Authentication and Pull Request environment for web development on Kubernetes infrastructure
  • Provide End-to-End testing infrastructures and visual regression testing infrastructures, and run them on each pull request


  • Shared belief in Mercari’s mission and values
  • Experience developing and/or operating web applications
  • Experience in at least one of the following:
    • Web frontend development experience using JavaScript, TypeScript, React, etc.
    • Experience building and operating Kubernetes infrastructures
    • Experience building and operating network infrastructures such as CDN, WAF, Load Balancer (like nginx)
    • Willingness to learn web technologies (PWA, dynamic rendering , Web Components, WebAuthn, etc) and microservice infrastructures (Kuberentes, GCP, Terraform, etc) regardless of frontend, backend, infrastructure

Nice to haves

These aren’t required, but be sure to mention them in your application if you have them.

  • Experience of Go programming
  • Knowledge of and experience with web authentication methods such as OAuth 2.0, OpenID Connect, Single Sign On, WebAuthn, etc.
  • Knowledge about web application security
  • Experience developing and operating systems using microservice architecture
  • Experience building and operating a monitoring environment and SLO, as well as detecting and handling system failures for web applications
  • Experience with software development on GCP

Meet Mercari's Developers

Jieqiong shares her experience of joining Mercari and working as a tech lead. She explains their engineering culture and provides tips for potential applicants.

Read her story...

Other Jobs at Mercari

Related jobs

More jobs like this

I'll send you a digest of new English-friendly software developer jobs in Japan. Your email stays private, I don’t share or sell it.